For Granite, I have the Granite Abomination. It is spawned by using a Pulsating Granite Rock in a Granite Biome. It looks like a huge, deformed Granite Golem which can't walk because of its own weight, so it has to drag itself along. Despite this, its pretty fast. It attacks by charging at the player, shooting lasers, jumping and body slamming the player, and shooting granite boulders. Most of these explode, but in expert mode, some of them turn out to be Granite Elementals.
For Marble, the Fallen Gladiator, which looks like a massive Hoplite with much more elaborate armor, and riding an armored skeleton horse. He attacks by shooting spears fast, going near the player and stabbing a Gladius at them, dashing at the player, throwing a mace at the player, and summoning Hoplites to attack the player. You summon him by using Gladiator's Medallion in the Marble Biome.
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